// Copyright (C) Kumo inc. and its affiliates.
// Author: Jeff.li lijippy@163.com
// All rights reserved.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.
//


// Adapted from Apache Arrow.

#include <sstream>
#include <utility>

#include <pollux/dwio/parquet/writer/arrow/properties.h>

#include "arrow/io/buffered.h"
#include "arrow/io/memory.h"
#include <turbo/log/logging.h>
#include "arrow/util/thread_pool.h"

namespace kumo::pollux::parquet::arrow {
    ReaderProperties default_reader_properties() {
        static ReaderProperties default_reader_properties;
        return default_reader_properties;
    }

    std::shared_ptr<ArrowInputStream> ReaderProperties::GetStream(
        std::shared_ptr<ArrowInputFile> source,
        int64_t start,
        int64_t num_bytes) {
        if (buffered_stream_enabled_) {
            // ARROW-6180 / PARQUET-1636 Create isolated reader that references segment
            // of source
            PARQUET_ASSIGN_OR_THROW(
                std::shared_ptr<::arrow::io::InputStream> safe_stream,
                ::arrow::io::RandomAccessFile::GetStream(source, start, num_bytes));
            PARQUET_ASSIGN_OR_THROW(
                auto stream,
                ::arrow::io::BufferedInputStream::Create(
                    buffer_size_, pool_, safe_stream, num_bytes));
            return std::move(stream);
        } else {
            PARQUET_ASSIGN_OR_THROW(auto data, source->ReadAt(start, num_bytes));

            if (data->size() != num_bytes) {
                std::stringstream ss;
                ss << "Tried reading " << num_bytes << " bytes starting at position "
                        << start << " from file but only got " << data->size();
                throw ParquetException(ss.str());
            }
            return std::make_shared<::arrow::io::BufferReader>(data);
        }
    }

    ::arrow::internal::Executor *ArrowWriterProperties::executor() const {
        return executor_ != nullptr
                   ? executor_
                   : ::arrow::internal::GetCpuThreadPool();
    }

    ArrowReaderProperties default_arrow_reader_properties() {
        static ArrowReaderProperties default_reader_props;
        return default_reader_props;
    }

    std::shared_ptr<ArrowWriterProperties> default_arrow_writer_properties() {
        static std::shared_ptr<ArrowWriterProperties> default_writer_properties =
                ArrowWriterProperties::Builder().build();
        return default_writer_properties;
    }
} // namespace kumo::pollux::parquet::arrow
